Industrial-grade reclosable fastener with 400 stem density mushroom heads, non-adhesive backing, audible snap closure, reusable 1000+ times, ideal for flexible assembly applications
The 3M™ Dual Lock™ Reclosable Fastener SJ3441 is an innovative fastening solution featuring interlocking mushroom-shaped heads with 400 stem density per square inch, delivering strong, reliable, and durable fastening that can be opened and closed multiple times. This black fastener provides an easy and clear alternative to traditional fastening methods such as screws, nuts, or bolts, making it ideal for applications requiring flexible assembly and disassembly. The non-adhesive back allows for attachment using hot melt, epoxy, or liquid adhesives, providing versatility in application methods.
With exceptional strength through its unique interlocking design, the SJ3441 fastener requires no drilling or screwing, simplifying installation and reducing assembly time. The product features an audible snap when secure, verifying proper closure, and can be easily disengaged by simply peeling the pieces apart by hand. It maintains its strength throughout hundreds of reattachments, making it an economical choice for long-term applications. The fastener mates with Type 170 or Type 250 stem densities to provide different strength combinations, allowing customization based on specific project requirements.
This reclosable fastener is well-suited for indoor and outdoor use with good temperature resistance up to 220°F (104°C). The product comes in a roll format measuring 1/2 inch wide by 50 yards long, with 4 rolls per case. It is designed for industrial and occupational use and provides a hidden fastener solution that maintains the aesthetic appearance of finished products while delivering superior holding power. The lightweight alternative to metal fasteners does not interfere with material integrity, making it perfect for electronics, furniture, medical devices, and packaging applications.
Key Features
- Interlocking mushroom-shaped heads with 400 stem density per square inch for strong, reliable fastening
- Non-adhesive backing compatible with hot melt, epoxy, and liquid adhesives for flexible attachment
- Audible snap verification when properly secured, ensuring closure confirmation
- Reusable 1000+ times with maintained strength through multiple open-close cycles
- Compatible with Type 170 and Type 250 stem densities for customizable strength combinations
- Temperature resistant up to 220°F (104°C) with excellent performance in indoor and outdoor environments
- No drilling or screwing required, simplifying installation and reducing assembly time
- Hidden fastener design maintains smooth aesthetic appearance without visible fastening hardware
Technical Specifications
| Specification |
Value |
| Product Number | SJ3441 |
| Brand | 3M Dual Lock™ |
| Overall Width (Imperial) | 0.5 in |
| Overall Width (Metric) | 12.7 mm |
| Overall Length (Imperial) | 50 yd |
| Overall Length (Metric) | 45.72 m |
| Product Color | Black |
| Product Form | Roll |
| Stem Density | 400 stems per square inch |
| Adhesive Type | Non-adhesive |
| Backing Material | Polyolefin |
| Engaged Thickness (Imperial) | 0.16 in |
| Engaged Thickness (Metric) | 4.1 mm |
| Maximum Operating Temperature (Fahrenheit) | 200°F |
| Maximum Operating Temperature (Celsius) | 93°C |
| Closure Life | 1000 cycles |
| Units per Case | 4 rolls |
| Smallest Saleable Unit | Roll |
| Flame Retardant | No |
| UPC Code | 00021200863660 |
| 3M ID | 7010383530 |
| Compatible Types | Mates with Type 170 and Type 250 stem densities |
| Application | Industrial/Occupational Use Only |
| Suitable Environments | Indoor and Outdoor Use |
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